ICSE Class 7 Answered

• Kidneys are dark red, bean shaped, 10 cm long and 6 cm wide in structure.
• The right kidney is slightly lower in position because of the presence of the liver.
• The renal artery supplies oxygenated blood to the kidneys.
• The renal veins take away deoxygenated blood from the kidneys.

Internal Structure of the Kidney:

• The longitudinal section of the kidneys shows two regions, an outer dark cortex and an inner lighter medulla.
• The medulla is composed of conical pyramids.
• The apex of each pyramid that is the papilla, projects into the renal pelvis.